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Self-Cleaning Surfaces

Group leader

Co-workers

Claudia Marschelke (PhD student)
Madeleine Schwarzer (PhD student)
Sandra Marx (Scientific co-worker)

Control and understanding of surface and interfacial phenomena is very important for the design of materials with defined wetting properties. There are two main factors, which affect surface wettability: surface roughness and intrinsic hydrophobicity/hydrophilicity of a material. Cassie and Wenzel were the first who discussed influence of these two factors on wetting and found that roughness “enhances” intrinsic wetting properties of materials and makes hydrophilic/hydrophobic materials even more hydrophilic/hydrophobic, respectively. In fact, the combination of surface roughness and hydrophobicity renders lotus leaves the ultrahydrophobicity.

Different approaches including plasma treatment, etching, sol-gel, photolithography etc were recently explored for preparation of ultrahydrophobic self-cleaning materials. These methods, however, can hardly be applied for large-scale fabrication. On the other hand, hydrophobic colloidal particles can easily be used to coat large areas and are already applied for the fabrication of self-cleaning surfaces.

  • de Francisco, R. ; Tiemblo, P. ; Hoyos, M. ; González-Caballero, F. ; García, N. ; Berglund, L. ; Synytska, A. Multipurose ultra and superhydrophobic surfaces based on oligodimethylsiloxane-modified nanosilica more ACS Applied Materials & Interfaces 6 (2014) 18998-19010
  • Ionov, L. ; Synytska, A. Self-healing superhydrophobic materials more Physical Chemistry, Chemical Physics 14 (2012) 10497-10502
  • Berger, S. ; Ionov, L. ; Synytska, A. Engineering of ultra-hydrophobic functional coatings using controlled aggregation of bicomponent core/shell janus particles more Advanced Functional Materials 21 (2011) 2338-2344
  • Synytska, A. ; Khanum, R. ; Ionov, L. ; Cherif, C. ; Bellmann, C. Water-Repellent Textile via Decorating Fibers with Amphiphilic Janus Particles more ACS Applied Materials & Interfaces 3 (2011) 1216-1220
  • Synytska, A. ; Ionov, L. ; Grundke, K. ; Stamm, M. Wetting on fractal superhydrophobic surfaces from "core-shell" particles : A comparison of theory and experiment more Langmuir 25 (2009) 3132-3136
  • Synytska, A. ; Ionov, L. ; Dutschk, V. ; Stamm, M. ; Grundke, K. Wetting on regularly structured surfaces from "Core-Shell" particles: Theoretical predictions and experimental findings more Langmuir 24 (2008) 11895-11901